How to calculate the circumference of a circle.
The circumference of a circle can be calculated using the formula:
2 x π x r
Where π (pi) = approx 3.14
and r = the radius
(You can divide the diameter by 2 to find the radius)
Example
You’ve been asked to calculate the circumference of a circle, you measure the diameter and find it is 2m.
First find the radius
Radius (r) = Diameter (D) ÷ 2
r = 2m ÷ 2
r = 1m
Then calculate the circumference (C)
C = 2 x π x r
C = 2 x 3.14 x 1m
C = 6.28 x 1m
C = 6.28m
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In the real sense of the world, Engineers normally use Pi X Diameter to calculate the circumference of the circle as it is difficult to measure radius on the field. Consequently the area of a circle is also calculated as pi X (D^2/4). Where D is the diameter.